class Calculaor(object):
    def __init__(self,number):
        self.number = number
    def __add__(self,other):
        self.number = self.number + other
        return self.number
    def __sub__(self,other):
        self.number =self.number-other
        return self.number
    def __mul__(self,other):
        self.number =self.number*other
        return self.number
    def __truediv__(self,other):
        self.number = self.number / other
        return self.number

callable = Calculaor(10)
print(callable +5)
print(callable -5)
print(callable *5)
print(callable /5)